| 摘要 |
Provided is a ball screw that effectively minimizes the intrusion of fine foreign matter between a male member and a female member, and that is capable of reducing sliding resistance when fitting the male member to a seal material. The ball screw is provided with: a male member (2) on which a male groove (7) is formed; a female member (3) having an inner peripheral surface on which a female groove (12) is formed, and having formed therein a circulation path (13) through which balls can circulate; and a seal material (4) that is provided to one end and/or the other end of the female member in the axial direction thereof. The male member and the female member are fitted together in the axial direction thereof. The seal material (4) is provided with: a fiber layer (14) that is made from fibers impregnated with rubber or a resin, and that comprises a hole (14a) that is capable of communicating with the inner peripheral surface of the female member (3), and a fitting surface (14b) on which a convex section (14c) is formed that is capable of fitting together with the male groove (7); and a resin layer (15) that is layered on a side (14d), said side (14d) being the side that is opposite the side of the fiber layer (14) on which the hole (14a) is formed. |
